CN101729764B - Shooting device and dead pixel compensation method for image sensor - Google Patents
Shooting device and dead pixel compensation method for image sensor Download PDFInfo
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- CN101729764B CN101729764B CN2008102010765A CN200810201076A CN101729764B CN 101729764 B CN101729764 B CN 101729764B CN 2008102010765 A CN2008102010765 A CN 2008102010765A CN 200810201076 A CN200810201076 A CN 200810201076A CN 101729764 B CN101729764 B CN 101729764B
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Abstract
The invention provides a shooting device and a dead pixel compensation method for an image sensor thereof. The shooting device comprises a register and a dead pixel compensating unit, wherein the dead pixel compensating unit is in charge of obtaining image data and a plurality of peripheral image data of the image data, selecting a reference level from the peripheral image data according to a numerical value stored by the register and updating the image data according to the reference level when the image data is larger than the reference level, and a difference between the image data and the reference level exceeds a critical value.
Description
Technical field
The invention relates to camera, technological with its image sensor compensating bad point.
Background technology
The image sensor (image sensor) of digital photographic device (digital camera) can be charge coupled device (Charge Coupled Device, CCD) or the formed active capture circuit of CMOS (CMOS active-pixel sensor) ... Deng electronic device.
Image sensor has bad point (defective pixel) unavoidably and exists; For example, the caused bright spot of leakage current (leakage) or open circuit (open circuit) caused dim spot.
How to overcome the bad some problem of image sensor, the target of being endeavoured for present technique field person.
Summary of the invention
The present invention provide a kind of camera, with its dead pixel compensation method for image sensor.
A kind of execution mode of camera of the present invention comprises a register and a compensating bad point unit.The compensating bad point unit be responsible for obtaining an image data, with a plurality of peripheral image data of this image data; According to the stored numerical value of this register; A little since then peripheral image datas select one first with reference to accurate position; Greater than this first when surpassing one first critical value, first upgrade this image data in this image data with reference to accurate position according to this with reference to accurate position and with this first gap with reference to accurate position.
In some embodiments, the compensating bad point unit more sorts these a little peripheral image datas according to size, and making non-peaked peripheral image data is candidate data.If the storage values of register belongs to a multiple compensating bad point pattern, the compensating bad point unit will select above-mentioned first with reference to accurate position according to a little since then candidate datas of the storage values of this register.
Above-mentioned technology can be revised the bright spot problem.In addition, the present invention more discloses the correction technique of dim spot.In some embodiments, the compensating bad point unit makes that the peripheral image data of non-minimum value is a candidate data.If the corresponding multiple compensating bad point pattern of the storage values of register, the compensating bad point unit selects one second with reference to accurate position according to a little since then candidate datas of the storage values of this register.If this image data second surpasses one second critical value with reference to accurate position and with this second gap with reference to accurate position less than this, the compensating bad point unit second upgrades this image data with reference to accurate position with this.
The present invention also proposes a kind of dead pixel compensation method for image sensor, comprising: set a register, the quality of its value reaction one image sensor; Receive an image data, with a plurality of peripheral image data of this image data; According to the stored numerical value of this register, select one first with reference to accurate position from those peripheral image datas; And in this image data greater than this first when surpassing one first critical value with reference to accurate position and with this first gap with reference to accurate position, first upgrade this image data according to this with reference to accurate position.
The present invention proposes a kind of dead pixel compensation method for image sensor in addition, comprising: receive an image data, with a plurality of peripheral image data of this image data; Those peripheral image datas are sorted according to size; With the data second largest in those peripheral image datas as one first with reference to accurate position; And in this image data greater than this first when surpassing one first critical value with reference to accurate position and with this first gap with reference to accurate position, first upgrade this image data according to this with reference to accurate position.
Description of drawings
For let above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, elaborate below in conjunction with the accompanying drawing specific embodiments of the invention, wherein:
Fig. 1 is a kind of execution mode of camera of the present invention;
The image data of the rgb format of Fig. 2 diagram one picture;
The flow chart of a kind of execution mode of Fig. 3 diagram compensating bad point technology of the present invention; And
The flow chart of the another kind of execution mode of Fig. 4 diagram compensating bad point technology of the present invention.
The primary clustering symbol description:
100～camera; 102～image sensor;
104～analog signal amplifier; 106～analogue-to-digital converters;
108～image processor; 110～image compressor reducer;
The signal that 112～image sensor 102 is sensed;
114,116～first, second format digital image;
118～screen; 120～hard disk;
122～register; 124～compensating bad point unit; And
202～corresponding image data G
33The 5x5 pattern.
Embodiment
Fig. 1 is a kind of execution mode of camera of the present invention.Camera 100 comprise an image sensor 102, an analog signal amplifier 104, analogue-to-digital converters (ADC) 106, an image processor 108, with an image compressor reducer 110.Image sensor 102 can be active capture circuit (CMOS active-pixel sensor) that charge-coupled device (CCD) or complementary metal-oxide semitransistor formed ... Deng electronic device, its function is the sensor light source signal.After the signal 112 that analog signal amplifier 104 is sensed image sensor 102 amplified, input analogue-to-digital converters 106 converted one first format digital image 114 into.Image processor 108 converts the first format digital image 114 into second format digital image 116.The second format digital image 116 can directly be play by a screen 118 or after 110 compressions of image compressor reducer, be stored in hard disk 120.
As shown in Figure 1, image processor 108 comprises a register 122 and a compensating bad point unit 124, in order to repair the image data of image sensor 102 bad points.Register 122 can be set before product export by manufacturer in advance.Different compensating bad point computings will be carried out according to register 122 stored values in compensating bad point unit 124.
In some embodiments, digitized video 114 can be rgb format.A kind of execution mode of Fig. 2 diagram is the image data of a picture wherein, comprises red image data R
Ij, green image data G
IjImage data B with blueness
Ij, i and j indicate image data in the position of picture.Compensating bad point device 124 can be collected the image data of a pattern (pattern) to each image data in the picture, carries out compensating bad point according to this.This execution mode adopts 5x5 pattern (pattern).
With image data G
33Be example, corresponding 5x5 pattern is a pattern 202.Other green image data G in the pattern 202
11, G
13, G
15, G
22, G
24, G
31, G
35, G
42, G
44, G
51, G
53, and G
55Be image data G
33Peripheral image data.Compensating bad point unit 124 is obtained in the pattern 202 behind all green image datas, can be according to the value of register 122 from peripheral image data G
11, G
13, G
15, G
22, G
24, G
31, G
35, G
42, G
44, G
51, G
53, and G
55Select one first with reference to accurate position, in image data G
33Greater than this first when surpassing one first critical value, first upgrade this image data G with reference to accurate position according to this with reference to accurate position and with this first gap with reference to accurate position
33(as upgrading image data G with reference to accurate position with first
33).Thus, can solve the bright spot problem.
In some embodiments, compensating bad point unit 124 is with peripheral image data G
11, G
13, G
15, G
22, G
24, G
31, G
35, G
42, G
44, G
51, G
53, and G
55According to the size ordering.This specification is with data P
Min, P
Min+1..., P
Max-1, P
MaxExpression is by little and big peripheral image data, and the image data of treating computing with data PUT representative is (like this routine image data G
33).If the corresponding single bad dot pattern of the value of register 122, compensating bad point unit 124 can make data P
MaxBe the accurate position of above-mentioned first reference.If the corresponding multiple compensating bad point pattern of the value of register 122, compensating bad point unit 124 can make second largest data P
Max-1As the accurate position of above-mentioned first reference.
In some embodiments, register 122 is not defined as single about the setting of multiple compensating bad point pattern.Compensating bad point unit 124 is with data P
Min, P
Min+1..., P
Max-1Be regarded as candidate data, when the corresponding multiple compensating bad point pattern of the value of register 122, according to the value of this register, from candidate data P
Min, P
Min+1..., P
Max-1Select above-mentioned first with reference to accurate position.If the bad point of image sensor 102 the more, the value that register 122 sets must make compensating bad point unit 124 select to heal little peripheral image data as the accurate position of above-mentioned first reference.For example, when image sensor 102 functions were good, the corresponding above-mentioned single bad dot pattern of the value that manufacturer can make register 122 deposit was with data P
MaxAs the accurate position of above-mentioned first reference; When image sensor 102 had at a small amount of bad, the value that manufacturer can make register 122 deposit made compensating bad point unit 124 with data P
Max-1Be the accurate position of above-mentioned first reference; Much more extremely image sensor 102 has when going bad point, and the value that manufacturer can make register 122 deposit makes compensating bad point unit 124 with data P
Max-2, even littler data (like P
Max-3, or other) be above-mentioned first with reference to accurate position.
In addition, the present invention more discloses the technology of compensation dim spot.Except the accurate position of above-mentioned first reference; Compensating bad point unit 124 can select one second with reference to accurate position from peripheral image data; Less than this second when surpassing one second critical value, second upgrade image data PUT (as upgrading image data PUT with reference to accurate position) in image data PUT with second with reference to accurate position according to this with reference to accurate position and with this second gap with reference to accurate position.
If the corresponding single bad dot pattern of the value of register 122, compensating bad point unit 124 can make data P
MinBe the accurate position of above-mentioned second reference.If the corresponding multiple compensating bad point pattern of the value of register 122, compensating bad point unit 124 can make time little data P
Min+1As the accurate position of above-mentioned second reference.
If register 122 is about not only single value of the setting of multiple compensating bad point pattern, compensating bad point unit 124 is with data P
Min+1..., P
Max-1, and P
MaxBe regarded as candidate data, when the corresponding multiple compensating bad point pattern of register 122, according to the value of this register, from candidate data P
Min+1..., P
Max-1, and P
MaxSelect above-mentioned second with reference to accurate position.If the bad point of image sensor 102 the more, the value that register 122 sets must make compensating bad point unit 124 select to heal big peripheral image data as the accurate position of above-mentioned second reference.For example, when image sensor 102 functions were good, the corresponding above-mentioned single bad dot pattern of the value that manufacturer can make register 122 deposit was with data P
MinAs the accurate position of above-mentioned second reference; When image sensor 102 had at a small amount of bad, the value that manufacturer can make register 122 deposit made compensating bad point unit 124 with data P
Min+1Be the accurate position of above-mentioned second reference; Much more extremely image sensor 102 has when going bad point, and the value that manufacturer can make register 122 deposit makes compensating bad point unit 124 with data P
Min+2, even bigger data (like P
Min+3, or other) be above-mentioned second with reference to accurate position.
Fig. 3 is the flow chart of a kind of execution mode of this case image sensor compensating bad point technology.A numerical value can be deposited at product one register by manufacturer before dispatching from the factory, in order to the bad some situation of reaction image sensor.For an image data PUT is carried out the compensating bad point computing, this method receives this image data PUT, with it a plurality of peripheral image datas, and get into step S302, these a little peripheral image datas according to the size ordering, are got data P
Min～P
MaxThen this method gets into step S304, reads above-mentioned register, judges whether correspondence one single bad dot pattern of the stored value of register.If the corresponding single bad dot pattern of register, this method execution in step S306 then, judgment data (PUT-P
Max) whether more than or equal to a critical value Th
1If then this method is according to data P
MaxUpgrade image data PUT (the for example computing shown in the step S308, PUT=P
Max).If the judged result of step S306 is not for, this method execution in step S310 then, judgment data (P
Min-PUT) whether more than or equal to a critical value Th
2If then this method is according to data P
MinUpgrade image data PUT (the for example computing shown in the step S312, PUT=P
Min).
If step S304 criterion register is not single bad dot pattern, then this method is carried out the compensating bad point computing of multiple bad dot pattern.As shown in Figure 3, this method gets into step S314, according to the stored value of register, from non-peaked peripheral data P
Min～P
Max-1Select first with reference to accurate position REF
1Peripheral data P from non-minimum value
Min+1～P
MaxSelect second with reference to accurate position REF
2Step S316 judgment data (PUT-REF
1) whether more than or equal to a critical value Th
3If then this method is according to data REF
1Upgrade image data PUT (the for example computing shown in the step S318, PUT=REF
1).If the judged result of step S316 is not for, this method execution in step S320 then, judgment data (REF
2-PUT) whether more than or equal to a critical value Th
4If then this method is according to data REF
2Upgrade image data PUT (the for example computing shown in the step S322, PUT=REF
2).
Among Fig. 3, the judgement formula of step S306 and S316 is to compensate about bright spot; The judgement formula of step S310 and S320 is to compensate about dim spot; The critical value Th that these a little judgement formulas are adopted
1～Th
4Can set up on their own by manufacturer, and these a little compensation operation S308, S312, S318 and S322 also can be replaced by other expression formula.In addition, the judgement formula that adopted of step S306, S310, S316 and S320 can not exist simultaneously; Some execution mode can only compensate bright spot, and some execution mode can only compensate dim spot.
Fig. 4 wherein need not set bad dot pattern with register, directly with data P for the flow chart of the another kind of execution mode of this case image sensor compensating bad point technology
Min+1With P
Max-1Bad point is judged in accurate as a reference position.Consult Fig. 4, this method receives this image data PUT, with it a plurality of peripheral image datas, and get into step S402, these a little peripheral image datas according to the size ordering, are got data P
Min～P
MaxThen this method gets into step S404, judgment data (PUT-P
Max-1) whether more than or equal to a critical value Th
1If then this method is according to data P
Max-1Upgrade image data PUT (the for example computing shown in the step S406, PUT=P
Max-1).If the judged result of step S404 is not for, this method execution in step S408 then, judgment data (P
Min+1-PUT) whether more than or equal to a critical value Th
2If then this method is according to data P
Min+1Upgrade image data PUT (the for example computing shown in the step S410, PUT=P
Min+1).
Among Fig. 4, the judgement formula of step S404 is to compensate about bright spot; The judgement formula of step S408 is to compensate about dim spot; The critical value Th that these a little judgement formulas are adopted
1With Th
2Can set up on their own by manufacturer, and these a little compensation operation S406 and S410 also can be replaced by other expression formula.In addition, the judgement formula that adopted of step S404 and S408 can not exist simultaneously; Some execution mode can only compensate bright spot, and some execution mode can only compensate dim spot.
In addition, not limit pattern be 5x5 pattern (like pattern 202) in the present invention.The pattern of Any shape all can be used to define the peripheral image data of an image data.
In addition, not limit handled image data be rgb format in the present invention.Image data can be rgb format, yuv format or other any form.
Claims (14)
1. camera comprises:
One register, the stored numerical value of this register is put a situation in order to the evil idea of reaction image sensor; And
One compensating bad point unit; Obtain an image data, with a plurality of peripheral image data of this image data; According to the stored numerical value of this register, select one first with reference to accurate position from those peripheral image datas, in this image data greater than this first when surpassing one first critical value with reference to accurate position and with this first gap with reference to accurate position; Upgrade this image data according to this accurate position of first reference
Wherein during the single compensating bad point pattern of the storage values of this register corresponding; This compensating bad point unit with data maximum in those peripheral image datas as this first with reference to accurate position; During the multiple compensating bad point pattern of the storage values of this register corresponding, this compensating bad point unit with the data second largest in those peripheral image datas as this first with reference to accurate position.
2. camera as claimed in claim 1 is characterized in that, this compensating bad point unit more sorts those peripheral image datas according to size, and making non-peaked peripheral image data is candidate data.
3. camera as claimed in claim 2 is characterized in that, the storage values of this register is to should be multiple during the compensating bad point pattern, and this compensating bad point unit selects above-mentioned first with reference to accurate position according to the storage values of this register from those candidate datas.
4. camera as claimed in claim 1; It is characterized in that; This compensating bad point unit is more according to the stored numerical value of this register; Select one second with reference to accurate position from those peripheral image datas, less than this second when surpassing one second critical value, second upgrade this image data with reference to accurate position according to this with reference to accurate position and with this second gap with reference to accurate position in this image data.
5. camera as claimed in claim 4 is characterized in that, the storage values of this register is to should be multiple during the compensating bad point pattern, this compensating bad point unit make in those peripheral image datas the second little data for this second with reference to accurate position.
6. camera as claimed in claim 4 is characterized in that, this compensating bad point unit more sorts those peripheral image datas according to size, and the peripheral image data that makes non-minimum value is a candidate data.
7. camera as claimed in claim 6 is characterized in that, the storage values of this register is to should be multiple during the compensating bad point pattern, and this compensating bad point unit selects above-mentioned second with reference to accurate position according to the storage values of this register from those candidate datas.
8. dead pixel compensation method for image sensor comprises:
Set a register, the stored numerical value of this register is put a situation in order to the evil idea of reaction image sensor;
Receive an image data, with a plurality of peripheral image data of this image data;
According to the stored numerical value of this register, select one first with reference to accurate position from those peripheral image datas; And
Greater than this first when surpassing one first critical value, first upgrade this image data in this image data with reference to accurate position according to this with reference to accurate position and with this first gap with reference to accurate position;
Above-mentioned selected this first step with reference to accurate position more comprises: when the single compensating bad point pattern of the storage values of this register corresponding, with data maximum in those peripheral image datas as this first with reference to accurate position; When the multiple compensating bad point pattern of the storage values of this register corresponding, with the data second largest in those peripheral image datas as this first with reference to accurate position.
9. method as claimed in claim 8 is characterized in that more comprising:
According to the size ordering, making non-peaked peripheral image data is candidate data with those peripheral image datas; And
To should be multiple during the compensating bad point pattern, select above-mentioned first with reference to accurate position from those candidate datas in the storage values of this register according to the storage values of this register.
10. method as claimed in claim 8 is characterized in that more comprising:
According to the stored numerical value of this register, select one second with reference to accurate position from those peripheral image datas; And
Less than this second when surpassing one second critical value, second upgrade this image data in this image data with reference to accurate position according to this with reference to accurate position and with this second gap with reference to accurate position.
11. method as claimed in claim 10 is characterized in that, above-mentioned selected this second step with reference to accurate position more comprises:
In the storage values of this register to should be multiple during the compensating bad point pattern, with the second little data in those peripheral image datas as this second with reference to accurate position.
12. method as claimed in claim 10 is characterized in that more comprising:
According to the size ordering, the peripheral image data that makes non-minimum value is a candidate data with those peripheral image datas; And
To should be multiple during the compensating bad point pattern, select above-mentioned second with reference to accurate position from those candidate datas in the storage values of this register according to the storage values of this register.
13. a dead pixel compensation method for image sensor comprises:
Receive an image data, with a plurality of peripheral image data of this image data;
Those peripheral image datas are sorted according to size;
With the data second largest in those peripheral image datas as one first with reference to accurate position; And
Greater than this first when surpassing one first critical value, first upgrade this image data in this image data with reference to accurate position according to this with reference to accurate position and with this first gap with reference to accurate position.
14. method as claimed in claim 13 is characterized in that more comprising:
With the second little data in those peripheral image datas as one second with reference to accurate position; And
Less than this second when surpassing one second critical value, second upgrade this image data in this image data with reference to accurate position according to this with reference to accurate position and with this second gap with reference to accurate position.
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| CN105718849B (en) * | 2015-10-21 | 2019-06-11 | 深圳芯启航科技有限公司 | Pixel scan method and device applied to fingerprint sensor |
| CN106952238A (en) * | 2017-03-21 | 2017-07-14 | 北京思比科微电子技术股份有限公司 | Bayer images remove bad pixels approach |
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